Figure 9From: Fusion beat in patients with heart failure treated with left ventricular pacing: may ECG morphology relate to mechanical synchrony? A pilot studyMitral regurgitation showed a tendency to reduce in the initial part of the fusion band, and was significantly lower at the two shortest AV intervals AV3 and AV4, with a reduction of 40% and 45% respectively compared to the LBBB pattern.Back to article page